private Button getArtifactDownloadButton(final Table table, final Object itemId) {
    final String fileName = (String) table.getContainerDataSource().getItem(itemId)
            .getItemProperty(PROVIDED_FILE_NAME).getValue();
    final Button downloadIcon = SPUIComponentProvider.getButton(
            fileName + "-" + UIComponentIdProvider.ARTIFACT_FILE_DOWNLOAD_ICON, "",
            i18n.getMessage(UIMessageIdProvider.TOOLTIP_ARTIFACT_DOWNLOAD), ValoTheme.BUTTON_TINY + " " + "blueicon", 
            true, FontAwesome.DOWNLOAD, SPUIButtonStyleNoBorder.class);
    downloadIcon.setData(itemId);
    FileDownloader fileDownloader = new FileDownloader(createStreamResource((Long) itemId));
    fileDownloader.extend(downloadIcon);
    fileDownloader.setErrorHandler(new ErrorHandler() {

        /**
         * Error handler for file downloader
         */
        private static final long serialVersionUID = 4030230501114422570L;

        @Override
        public void error(com.vaadin.server.ErrorEvent event) {
            uINotification.displayValidationError(i18n.getMessage(UIMessageIdProvider.ARTIFACT_DOWNLOAD_FAILURE_MSG));
        }
    });
    return downloadIcon;
}
 

protected void initializeDownload() {
	//
	// Create a stream resource pointing to the file
	//
	StreamResource r = new StreamResource(new StreamResource.StreamSource() {
		private static final long serialVersionUID = 1L;

		@Override
		public InputStream getStream() {
			try {
				return new FileInputStream(self.file);
			} catch (Exception e) {
				logger.error("Failed to open input stream " + self.file);
			}
			return null;
		}
	}, self.file.getName());
	r.setCacheTime(-1);
	r.setMIMEType("application/xml");
	//
	// Extend a downloader to attach to the Export Button
	//
	FileDownloader downloader = new FileDownloader(r);
	downloader.extend(this.buttonExport);
}
 

private void constructBody() {
    final MVerticalLayout layout = new MVerticalLayout().withFullWidth();
    CssLayout iconWrapper = new CssLayout();
    final ELabel iconEmbed = ELabel.fontIcon(FileAssetsUtil.getFileIconResource(content.getName()));
    iconEmbed.addStyleName("icon-48px");
    iconWrapper.addComponent(iconEmbed);
    layout.with(iconWrapper).withAlign(iconWrapper, Alignment.MIDDLE_CENTER);

    final GridFormLayoutHelper infoLayout = GridFormLayoutHelper.defaultFormLayoutHelper(LayoutType.ONE_COLUMN);

    if (content.getDescription() != null) {
        final Label descLbl = new Label();
        if (!content.getDescription().equals("")) {
            descLbl.setData(content.getDescription());
        } else {
            descLbl.setValue(" ");
            descLbl.setContentMode(ContentMode.HTML);
        }
        infoLayout.addComponent(descLbl, UserUIContext.getMessage(GenericI18Enum.FORM_DESCRIPTION), 0, 0);
    }

    UserService userService = AppContextUtil.getSpringBean(UserService.class);
    SimpleUser user = userService.findUserByUserNameInAccount(content.getCreatedUser(), AppUI.getAccountId());
    if (user == null) {
        infoLayout.addComponent(new UserLink(UserUIContext.getUsername(), UserUIContext.getUserAvatarId(),
                UserUIContext.getUserDisplayName()), UserUIContext.getMessage(GenericI18Enum.OPT_CREATED_BY), 0, 1);
    } else {
        infoLayout.addComponent(new UserLink(user.getUsername(), user.getAvatarid(), user.getDisplayName()),
                UserUIContext.getMessage(GenericI18Enum.OPT_CREATED_BY), 0, 1);
    }

    final Label size = new Label(FileUtils.getVolumeDisplay(content.getSize()));
    infoLayout.addComponent(size, UserUIContext.getMessage(FileI18nEnum.OPT_SIZE), 0, 2);

    ELabel dateCreate = new ELabel().prettyDateTime(DateTimeUtils.toLocalDateTime(content.getCreated()));
    infoLayout.addComponent(dateCreate, UserUIContext.getMessage(GenericI18Enum.FORM_CREATED_TIME), 0, 3);

    layout.addComponent(infoLayout.getLayout());

    MButton downloadBtn = new MButton(UserUIContext.getMessage(GenericI18Enum.BUTTON_DOWNLOAD))
            .withIcon(VaadinIcons.DOWNLOAD).withStyleName(WebThemes.BUTTON_ACTION);
    List<Resource> resources = new ArrayList<>();
    resources.add(content);

    StreamResource downloadResource = StreamDownloadResourceUtil.getStreamResourceSupportExtDrive(resources);

    FileDownloader fileDownloader = new FileDownloader(downloadResource);
    fileDownloader.extend(downloadBtn);

    MButton cancelBtn = new MButton(UserUIContext.getMessage(GenericI18Enum.BUTTON_CANCEL), clickEvent -> close())
            .withStyleName(WebThemes.BUTTON_OPTION);
    MHorizontalLayout buttonControls = new MHorizontalLayout(cancelBtn, downloadBtn);
    layout.with(buttonControls).withAlign(buttonControls, Alignment.MIDDLE_RIGHT);
    this.setContent(layout);
}
 

private void addAttachmentRow(Content attachment) {
    String docName = attachment.getPath();
    int lastIndex = docName.lastIndexOf("/");
    if (lastIndex != -1) {
        docName = docName.substring(lastIndex + 1);
    }

    final AbsoluteLayout attachmentLayout = new AbsoluteLayout();
    attachmentLayout.setWidth(WebUIConstants.DEFAULT_ATTACHMENT_THUMBNAIL_WIDTH);
    attachmentLayout.setHeight(WebUIConstants.DEFAULT_ATTACHMENT_THUMBNAIL_HEIGHT);
    attachmentLayout.setStyleName("attachment-block");

    MCssLayout thumbnailWrap = new MCssLayout().withFullSize().withStyleName("thumbnail-wrap");

    Link thumbnail = new Link();
    thumbnail.setTargetName("_blank");
    if (StringUtils.isBlank(attachment.getThumbnail())) {
        thumbnail.setIcon(FileAssetsUtil.getFileIconResource(attachment.getName()));
    } else {
        thumbnail.setIcon(VaadinResourceFactory.getResource(attachment.getThumbnail()));
    }

    if (MimeTypesUtil.isImageType(docName)) {
        thumbnail.setResource(VaadinResourceFactory.getResource(attachment.getPath()));
    }

    Div contentTooltip = new Div().appendChild(new Span().appendText(docName).setStyle("font-weight:bold"));
    Ul ul = new Ul().appendChild(new Li().appendText(UserUIContext.getMessage(FileI18nEnum.OPT_SIZE_VALUE,
            FileUtils.getVolumeDisplay(attachment.getSize())))).setStyle("line-height:1.5em");
    ul.appendChild(new Li().appendText(UserUIContext.getMessage(GenericI18Enum.OPT_LAST_MODIFIED,
            UserUIContext.formatPrettyTime(DateTimeUtils.toLocalDateTime(attachment.getLastModified())))));
    contentTooltip.appendChild(ul);
    thumbnail.setDescription(contentTooltip.write(), ContentMode.HTML);
    thumbnail.setWidth(WebUIConstants.DEFAULT_ATTACHMENT_THUMBNAIL_WIDTH);
    thumbnailWrap.addComponent(thumbnail);

    attachmentLayout.addComponent(thumbnailWrap, "top: 0px; left: 0px; bottom: 0px; right: 0px; z-index: 0;");

    MCssLayout attachmentNameWrap = new MCssLayout().withWidth(WebUIConstants.DEFAULT_ATTACHMENT_THUMBNAIL_WIDTH)
            .withStyleName("attachment-name-wrap");

    Label attachmentName = new ELabel(docName).withStyleName(WebThemes.TEXT_ELLIPSIS);
    attachmentNameWrap.addComponent(attachmentName);
    attachmentLayout.addComponent(attachmentNameWrap, "bottom: 0px; left: 0px; right: 0px; z-index: 1;");

    MButton trashBtn = new MButton("", clickEvent -> {
        ConfirmDialogExt.show(UI.getCurrent(), UserUIContext.getMessage(GenericI18Enum.DIALOG_DELETE_TITLE,
                AppUI.getSiteName()), UserUIContext.getMessage(GenericI18Enum.CONFIRM_DELETE_ATTACHMENT),
                UserUIContext.getMessage(GenericI18Enum.ACTION_YES),
                UserUIContext.getMessage(GenericI18Enum.ACTION_NO),
                confirmDialog -> {
                    if (confirmDialog.isConfirmed()) {
                        resourceService.removeResource(attachment.getPath(), UserUIContext.getUsername(), true, AppUI.getAccountId());
                        ((ComponentContainer) attachmentLayout.getParent()).removeComponent(attachmentLayout);
                    }
                });
    }).withIcon(VaadinIcons.TRASH).withStyleName("attachment-control");
    attachmentLayout.addComponent(trashBtn, "top: 9px; left: 9px; z-index: 1;");

    MButton downloadBtn = new MButton().withIcon(VaadinIcons.DOWNLOAD).withStyleName("attachment-control");
    FileDownloader fileDownloader = new FileDownloader(VaadinResourceFactory.getInstance().getStreamResource(attachment.getPath()));
    fileDownloader.extend(downloadBtn);
    attachmentLayout.addComponent(downloadBtn, "right: 9px; top: 9px; z-index: 1;");
    this.addComponent(attachmentLayout);
}